**Appendix A**

The indicators of absolute percentage error (*APE*%), mean absolute error (*MAE*), mean absolute percentage error (*MAPE*), root mean squared error (*RMSE*), root mean squared error percentage (*RMSE*%), and correlation coefficient (*R*) were used for evaluations of the model. The following equations describe these indicators:

$$APE = \frac{|\mathbf{y}\_i - \mathbf{x}\_i|}{\mathbf{x}\_i} \times 100\tag{A1}$$

$$MAE = \frac{1}{n} \sum\_{i=1}^{n} |x\_i - y\_i| \tag{A2}$$

$$MAPE = \frac{1}{N} \sum\_{i=1}^{N} (\frac{|y\_i - \mathbf{x}\_i|}{\mathbf{x}\_i} \times 100) \tag{A3}$$

$$RMSE = \sqrt{\frac{1}{n} \sum\_{i=1}^{n} (x\_i - y\_i)^2} \tag{A4}$$

$$RMSE \%= \left(\frac{RMSE}{x\_{\text{max}} - x\_{\text{min}}}\right) \times 100\tag{A5}$$

$$R = \frac{\sum\_{i=1}^{n} (\mathbf{x}\_i - \bar{\mathbf{x}})(y\_i - \bar{y})}{\sqrt{\sum\_{i=1}^{n} (\mathbf{x}\_i - \bar{\mathbf{x}})^2 \sum\_{i=1}^{n} (y\_i - \bar{y})^2}} \tag{A6}$$

where *xi* and *x*¯*i* are the actual load value and mean of the actual load value and *yi* and *y*¯*i* are the forecasted load value and mean of the forecasted load value, respectively.
